PB       
noun [ C ]  sports UK informal specialized uk/ˌpiːˈbiː/ us/ˌpiːˈbiː/
 个人最好成绩(personal best的缩写)
abbreviation for  personal best 
  He won the race and set a new PB. 他赢得了比赛并创造了个人最好成绩。 
 
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